OTP(One Time Programmable) means one time programmable voice chip. Voice can be only programmed once. Voice playing length can be 10s, 20s, 40s, 80s, 105s, 165s, 170s, 340s. OTP chips are cheap, suitable for small or medium batch production.

Programmable voice chip, this kind of voice chip can be reprogrammed, also we have multiple-time programmable(MTP) voice chip, programmable voice chip with large storage space. Control mode and voice content can easily be replaced. Can add 1Mbit-128Mbit Flash, voice up to 5000s, 510 sections of speech addresses.

Voice module is based on voice chip, developed for customers, more convenient for early development, large-capacity storage type voice circuit. The overall integration is high. Can add the maximum 128Mbit SPI-Flash. Can load WAV and AD4 format sound.

Voice module takes the voice chip as the master control core, has MP3 control mode, one-to-one key control mode (3-segment voice and 5-segment voice), power-on loop playback control mode and 2-wire serial port control mode. Control mode has been set in the chip sample production. During the operation, can not switch various control modes. Control mode can be set by yourself or we custom for you.

Features and advantages

☆Module package (with SPI-Flash and peripheral circuit) has DIP16, DIP28 types, no need to debug the chip characteristics by yourself.

☆Different SPI-Flash has different playing time. Support 2M~128Mbit SPI-Flash memory.

Record by pressing REC button. After recording, press PLAY button to play the recording.

As for the using function, voice chip is divided into voice recording chip and voice playback chip. If your products need voice chip, first you should consider whether you need live recording. If you need to record voice, please choose voice recording chip, otherwise, you just choose voice playback chip. Generally, recording chip has the function of playing the recording, but the sound quality of playing recordings is not better than the sound playing quality of voice playback chip. Therefore, when you choose voice chip, consider the function and sound quality carefully.

MP3 chip supports MP3 audio decoding. It can play according to the specified file name or the specified index number. Can use folder to classify. Support three kinds of memory: SPI-FLASH, micro SD card, USB flash disk.

This voice speaker integrates speech sound circuit, power supply, communications, horn. Traditional speaker must rely on other auxiliary component to make asound. There are many voice chips and speakers on the market, multifarious. Service level and the technical supportare also uneven. Selection and design need a lot of time. Our voice speakers can make you complete all the design and selection, saving your time.

Features and advantages

☆Fast realizing voice function.

☆High integration, voice chip and speaker integration, easy for user to stock and easy for engineer to use.

Speech recognition chip is also called speech recognition IC. Speech recognition chip, the most important feature is speech recognition. It can let the machine understand the human voice, and can carry out various actions according to the command, such as blinking, moving lips (smart doll). In addition, the speech recognition chip also has high quality, high compression recording and playback function, can realize the man-machine dialogue.

Speech recognition function: Can identify the default speech words or phrases, output through serial port and IO port, and identify the result.

Playback function: Through MCU instructions, play the specified voice, at the same time, through the BUSY pin mark, judge whether there is voice play.

Features and advantages

☆ Voice recognition rate up to 90% within half a meter.

☆ Control output through voice command.

☆ Play the specified voice through MCU serial communication control.

☆ Three output modes: serial output, IO output, speaker output.

☆ PWM output can directly drive 0.5W/8Ω speaker.

☆ Differential amplifier circuit.

☆ Voice recognition distance up to 2~3m in a quiet environment.

☆ Can add SPI flash to increase the storage capacity.

☆ Can store many groups of words.

☆ Speaker-independent recognition.

☆ Support 32 languages, such as Chinese, English,Cantonese, Japanese etc.

Multi-function test board is small size, multi-function, downloading and testing function integrated together, can be used for programming and testing WT588D, WTV-S, WTV-SR(needswitch seat added on WTV-SR module), WTV-NAND modules.

Copy machine, support computer online copy and offline copy. Offline copy can be chip to chip copying, can also copy from SD card to chip, can be used for ISD1700 series of voice chips.

Programmer can simultaneously program and copy two ISD devices. When programing, can also detect one chip. The dedicated "programming copy software" is directly controller by computer to program system (that can specify any address to write, modify the voice content), copy, test address. That is simple, easy to operate, good copying sound quality, support ISD all 3V devices: ISD4002, ISD4003, ISD4004 and other devices.

Features and advantages

☆ Perfect embedded programming scheme, can use the dedicated software to have comprehensive control of the copy machine on computer.☆ SRS232 serial port line connected with computer.☆ With recording monitor, recording playback function.☆ BUSY signal indicator light.☆ Power indicator light.☆ DC9V power input end.☆ Lock seat, can be placed in WT588D module, WT588D with SPI-Flash (need to switch seat), placed on the bottom.

PowerSound voice prompter is one of the five major Sound series. Power, the meaning is big strength, big energy, big power, is the exclusive brand name of high-power voice prompter seriesin my company.

The size of PowerSound series is the largest, loudest in our voice prompter products, suitable for both indoor and outdoor application, especially some noisy areas. Another extension category --PowerSound OD, is the voice prompt device especially for outdoor use, the appearance totally different from the ordinary PowerSound series.

According to the induction way, powersound series have infrared induction and microwave induction. According to the appearance and use of occasions, there are wall-hanging type and ceiling type. All of them can support DIY. Features and accessories can be customized. The sensor has wide induction range. The volume is up to 10 levels, mainly for some construction site, building site, station, outdoors and other noisy place.

SmartSound voice prompter is one of the five major Sound series. Smart, the meaning is intelligent, sensitive, looks like a small robot, special, cute.

The induction way of SmartSound voice prompter series is infrared human body induction. When people enter the sensor range, it can accurately identify, detect human activity information, passiveinduction. It seems like cat's eyes, not rely on light. Even in the dark environment,the device can alsowork normally, overcoming the lack of lightinduction.

SmartSound voice prompter havetwo types: one-way identification and two-way identification. For one-way identification type, such as, in orout, only play the same voice content; but two-way identification, according to the direction inor out, play different voice content. For example, in is "welcome"and out is the "welcome to visit nex time". Voice content can be replaced by yourselves. This device has been widely used in major banks for safetyprompt, welcome alarm.

Another SmartSound voice prompter type is named SmartBell, smart doorbell with remote controller. This product combines the wireless remote control doorbell and human bodyinduction technology. we can develop and produce according to the user's special needs. Voice doorbell and sensor can be placed separately, such as sensor in the outdoor, doorbell in the room. Whensomeone enters the store, the indoor doorbell will play voice content, to remind the user someone coming.

Features and advantages

☆ Adopt infrared human body induction technology.☆ Accurate direction recognition technology, automatic trigger to play voice.☆ Voice content can be replaced according to the different needs of users.☆ Power-off memory function.☆ Can identify direction to play different sounds.☆ Play mode: single cycle, order play, random play mode.☆ MP3 play scheme, better than the ordinary sound.☆ Support external micro SD card or built-in SPI-FLASH to play, preferred micro SD card, which supports hot-swap.☆ Using micro SD card to update voice files of the device.☆ Support MP3 audio.

MicroSound voice prompter is one of the five major Sound series. Micro, the meaning is mini, small. Microsound has many types, the smallest size of the five majorSound series.

At present, MicroSound series have infrared bodyinduction (one-way), two-way identification human induction, timing human induction voice prompter, door magnetic induction voice prompter, RJ11 trigger play voice andrecording voice reminder and so on. Except RJ11 trigger, others are infrared human body induction. The difference of one-way and two-way/ direction identification is whether to play the same voice content when people go in/ out. One-way identification type will play the same voice content,but two-way identification type, according to the direction in or out, play different voice content. For example, in, play "welcome"; out, play "welcometo visit next time". The doormagnetic induction type will play voice when people open or close the door. Timing version is timing play and time-interval play by remote controller, to meet therequirements in special occasions. Recording version is that users can record voice andplay the recordings. Thevoice need is more flexible. RJ11 triggering to play sound is the play mode of RJ11 printer. Users can choose according to the use requirement and occasion application. We have the ability to research and develop, also provide personalized customization anddevelopment services according to the specific need of users.

Features and advantages

☆ Small and exquisite, high-quality MP3 voice play, good sound quality.☆ Optional multi-level volume.☆ Human body induction trigger to play voice.☆ Door magnetic induction trigger to play voice.☆ External trigger to play through the RJ11 interface.☆ Support recording function, can record 40 seconds.☆ Power-off memory function.☆ A, B button corresponding to the previous song, next song.☆ A, B mode free to switch, A mode is the whole song loop, B modeis the single loop.☆ Voice content can be replaced free according to the different needs of users.

1. Welcome alarm, voice prompter, voice advertising machine, voice promotion machine, voice guide machine;2. Hospital doors and windows safetyprompter, residential safety doors and windows safety alarm, voice reminder not to forget the key, turn off the water and electricity, close the door, gas and other security voice prompter.3. Voice prompt for the printers in restaurant, hoteletc.4. Used in ethnic minority areas. Some minority languages can not be synthesized, but can be recorded directly. Then device can playthe recording to prompt.

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iSound voice prompter is one of the five major Sound series. Now it is upgraded to iSound II. This series products have direction identification timing type, infrared induction (one-way) and human body induction direction identification type. Different types have different using functions. Users choose according to the needs, occasions. This product has been widely used in bank, escalator safety warning, reminder.

iSound voice prompter is infrared body induction. The difference of one-way and two-way/ direction identification is whether to play the same voice content when people go in/ out. One-way identification type will play the same voice content, but two-way identification type, according to the direction in or out, will play different voice content. For example, in, play "welcome"; out, play "welcometo visit next time". Users can choose according to the use requirement and occasion application. We have the ability to research and develop, also provide personalized customization and development services according to the specific need of users.

Features and advantages

☆ Support 8 ~ 320Kbps MP3 audio format.

☆ Easy to update voice content by copying the audio file to memory via USB flash disk.☆ Can download MP3 files(less than 4M ) to play through the USB flash disk.

☆ Key lock function, to prevent false triggering or illegal operation.☆ Can connect an external active speaker (external amplifier).☆ External trigger function (low pulse active);☆ Have a set of relay switches, close when voice play -default delay off time is 30s.

KingSound voice prompter is one of the five major Sound series, aluminum alloy material,more special than others. There are gold, gray and silver three colors for option.KingSound voice prompter is also using infrared human body induction technology. The difference of one-way and two-way/ direction identification is whether to play the same voice content when people go in/ out. One-way identification type will play the same voice content, but two-way identification type, according to the direction inor out, will play different voice content. For example, in, play "welcome"; out, play "welcome to visit next time".

Another type is KingSound II, suspended ceiling design, different from the ordinary version of KingSound, white appearance. It can use remote controller to have timing play control,time-interval play, remote controller and so on.

There are many kinds of products. The user can choose according to the use requirements and occasion applications. We have the ability to research and develop, also provide personalized customization anddevelopment services according to the specific need of users.

☆ Loop play function, power-off memory function.☆ Clock display function, set the current time, previous/ next song selection andvolume up/down by infrared remote controller.☆ Built in 8Ω /10W high-power speaker, 8 levels of volume.☆ Through the ConFig document, configure the play mode, track, time period, volume levels.

Motor Vehicle Safety Management System (VSMS) is a system, based on the solution to solve the hidden dangers of forklift and enterprise forklift safety management .This system is mainly used for factory forklift management. At present, there are three types: forklift over speed alarm, forklift speed limit alarm, forklift safety management system.

Forklift over speed alarm, as the name implies, when forklift exceeds the standard speed, system will alarm to prompt driver attention to slow down.

Forklift speed limit alarm, this one can directly limit the speed of forklift. Preset the speed value, such as 20km/H,then forklift speed will be controlled within 20km/h.

Forklift safety management system is mainly used for enterprise forklift and driver management, monitoring. It can be used with backgroundmanagement system. Forklift drivers need IC card to access vehicles. Enterprise managers can check the driving record of each vehicle, driver attendance,speeding record, overspeed time, and who over speed in real time. When the forklift faulty or damage occurs, managers can be easier toknow those who are involved, investigated for their responsibilities

About the product installation, our company is the only company who designs and manufactures wireless speed sensorto have wireless installation in China. Wirelessinstallation method greatly simplifies the product installation process, without damaging the vehicle. We own the forklift safety management system wireless sensor patent.

☆ Remote control settings, system can be remotely set within 1 meter range via IR controller.

☆ Lock the alarm: When forklift over speed the 3rd speed level for a long time (0 ~ 99 seconds, can be adjusted by user), alarm will be locked all the timeuntil administrator use administrator IC card to unlock alarm.

There are many major accidents occurring caused by vehicleover speeding. The loss and death rate caused by special heavy vehicles is highest. Most of heavy vehicles have not installed speed limit device. At present, many countries have already made relevant state laws and regulations for heavy special vehicles: all heavy vehicles must install the speed limit device.

GPS vehicle speed limiter, this type device installation is simpler than the ordinary type of vehicle speed limiter, more functions, can be directly used on the car, do not need too complicated installation. This device detects speed through the GPS signal.

Above two products are popular in market, but there are some customers require solutions to vehicle management and monitor, such as want to see the vehicle travel route and limit the vehicle driving area, limit different speed in different road, real-time location of vehicle, check vehicles whether over speed or not, remotely issue instructions to force vehicle to limit speed. So we launch GPS intelligent speed limiter. This device can work with cloud server to remotely monitor, check and issue instructions, solving vehicle fleet management problem, convenient for enterprise to protect their profit and protect the safety of vehicle and driver.

This anti-collision warning system is a kind of device for motor vehicle collision avoidance, can be applied in factory forklifts. Installedon the forklift, set the dangerous distanceinduction range, when the person who wears the rangingtag is close to the dangerous range,this device will give soundand light alarm, to remind the operator that someonecoming, he should move away or stop operating, also warn theperson with tag that he should pay attention to safety, staying away from this dangerous area.

This product can be used in factory to prevent the collision of people, object, vehicle in the operating process, to reduce accidents, to protect the interests of enterprises.

Features and advantages

☆Adopt wireless pulse technology, accurately measure the position of the tag and the host by measuring thetravel time of the pulse in space.

☆Sound and light alarm, support speed limit function (optional).

☆Anti-collision area and warning area can be set by infrared remote controller.

Motor vehicle reversing collision avoidance warning system, using ultrasonic detection technology, has features of wide detection range, small blind area, long distance. When the ultrasonic probe detects obstacles in effective range, the host will send the actual distance between obstacles and motor vehicle to the alarm device through wireless signal, in order to avoid collision.This product is special for large vehicles. Even if the car body is very long and wide, it can know everything behind the vehicle.

At present, the product is divided into two types: ordinary type and image type. Ordinary type is through ultrasonic probe to detect obstacles, then send the signal to display and buzzer; the buzzer will give alarm prompt to driver; the driver can also see the obstacle distance on the display.

Image type is mainly through the buzzer alarm and LCD display, can prevent the danger caused by bad reverse vision. This product is equipped with infrared night vision camera. Even at night, without any light source, through the infrared fill-in light, can also reverse easily, to prevent vehicles from hitting people or objects, to ensure the safety when reversing.

Audible and visual alarm is also called sound-light alarm, a kind of alarm device giving warning signals through sound and light. It is developed to satisfy customer’s special requirements to alarm loudness and installation position, widely used in some dangerous operation area or the area where need high-power sound playing to give hazard warning signal.

At present, there are four types with different functions: wireless remote control type, power-on play type, microwave induction type, portable type.

Wireless remote control sound-light alarm adopts the acousto-optic control technology, wireless remote controller can remotely control the device power on or off, remote wireless control. Power-on play, that is, once power on, the device will sound. User canuse the infrared remote controller to adjust volume up and down,replace voice remotely. Microwave induction type adopts radar wave induction technology. When detecting something passing by, alarm light will flash and the device will have voice prompt. Portable type is built in rechargeable battery, can be used alone withoutpower source, microwave induction, flexible market environment, not restricted by power supply.

Bus station announcer is also named bus station stop reporter, widely applied in bus, tourist coach, coach. Intelligent bus stop announcer is based on global positioning system to have automatic voice announcement to remind passenger when bus arrive at the station, no need of manual operation. GPS bus stop reporter will memory each station of bus lines. When the bus arrives at the station, it will broadcast the station name automatically. When the bus is out of the station range, it will forecast the next stop.

Features and advantages

² Support GPS information output.

² Bar-type LED display.

² Can store voice information of 99 bus lines, two directions in each line, max 80 stations in each direction.

² Except bus station voice announcement, also support advertisement or mp3 music play or others.

² Support many kinds of language.

² Through the matched software MPSTA, voice content of bus lines can be edit, made, downloaded. voice message can be changed easily.

² Adopt USB2.0 communication, data transmission faster.

² For the buses running on the same line, only one of the device set successfully, others can be set directly by copying the information.

High-power audio speaker belongs to simple voice prompt device. Once connected to power, it can work. According to the trigger port, can select which audio to play. This product is suitable for indoor and outdoor, where need loud volume.

Loop playback/single play,other trigger play modes can also be realized. This series of product is easy to replace the voice. You can usemicro SD cardto offline replace audio files. It can play the audio files of micro SD card. You can also use USB cable to copy audio by connecting to computer,where will display the disk. Delete the previous audio files first, then copy new files into the speaker.

Waycare I is launched by our company, focusing on driving safety, automatically detecting the running state of cars and reminding drivers to pay attention to their driving behavior. Waycare I has many warning functions: overspeed prompt, battery aging warning, battery power prompt, car maintenance, correcting driving behavior and so on.

Voice prompts help car owners to know the cars’ battery usage and battery life, to replace battery timely and avoid running troubles, car maintenance reminding in advance, to improve security, warm prompt to help driver to correct the nonstandard driving behavior and know some car maintenance knowledge. Overspeed warning, over 120 km/h speed every 1 minute, it will remind the owner that he is overspeeding, should pay attention to safety.

Waycare II, on the basis of the first generation, increases the function of APP interconnection mode, which can connect the phone APP to check car’s water temperature, speed, voltage, can also have fuel consumption analysis, maintenance prompt, etc.

Bluetooth Module, including chip, has many versions: 1.0, 2.0, 3.0, 4.0, 4.2, and 5.0. Our Bluetooth modules have the advantages of industrial grade design, stable data transmission, easy operation and cost advantage, widely used for wired(serial port) converted to wireless data transmission. It supports Bluetooth SPP standard protocol, which can be connected to all Bluetooth-enabled Android phones, notebooks, computers and Bluetooth master modules, to send and receive data in both directions.

Our Bluetooth module series, except the ordinary transmission module, the other are the audio Bluetooth module and LED dimming module. Audio Bluetooth module is WT2600 module, can have audio play function after connecting Bluetooth. LED dimming module is WT2800 module, with our dedicated APP, achieve the lamp brightness adjustment, color temperature adjustment, RGB color adjustment, different flashing mode adjustment, lighting timing control and other functions. Of course, we not only sell sound modules, but we also have ability to develop and manufacture, we can customize products to meet customer needs.

Features and advantages

☆Standard UART communication interface, bit rate 9600(in default), can flexibly achieve the specified address playback, specify the file name to play, specify the folder file playback, volume levels, previous and next, play stop, combined play, memory switch, select the playback mode and other modes. When power on, not play by default.

Control RGB LED light bar, LED light control module and other products’ light control. Used for children toys, city brightening, stage effect, festival celebrations, home brightening, light decoration and other occasions.

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WTZMO5W1 is an ultra-low power embedded WIFI module developed by the Shenzhen Waytronic Electronics Ltd,using the industry's lowest power embedded high-performance WIFI network processor. In the module hardware, MAC, RF transceiver unit, power amplifier unit, and the M4 core unit for users to develop are integrated. It supports the 802.11b/g/n protocol standards. The WTZM05W1 module is a low power WIFI module, which can help customers to upgrade the product fromthe basic serial communication to wireless network communication.

Features and advantages

☆ Support 802.11 b/g/n protocol standard, WPA/ WPA2 encryption modes.

☆ Use Smartconfig and WPS configuration(provide three kinds of APP code).

Smart socket is different from the ordinary socket; it is intelligent wireless control socket, wireless remote control by mobile phone APP, to achievethe functions of electric appliance timing, measurement, on/off and so on.

Our smart socket brand is i-Timer,including wifi smart socket, Bluetooth smart socket, GSM smart socket. All of them have APP software for remote control. We not only provide the finished products, but also provide product development and customization services. Mobile phone wifi remote control timing socket is based on wifi communication; can achieve socket Internet of things; through smart phone, users anywherecan control electric appliances athome or in the office. We have both Android, and IOS APP. Our bluetooth socket is divided into mobile phone bluetooth remote control timing socket and mobile phone remote sensing timing socket. Bluetooth smart socket based on Bluetooth 2.0/4.0 communication, can achieve mobile phone bluetooth connected with socket, not need external equipment (router). The ordinary version is that user manually connect with the socket bluetooth. The remote sensing version is automatic distance detectedand phone automatically connected/ disconnected (can also manually control). GSM timing socketis built in GSM module, through the SMS command/ APP control socket, not affected by distance; without networking, even can achieve the user’s mobile phone to communicate with the product at any time and any place, making equipment, electrical appliances more intelligent.

At workor in life, many people often use mobile phone to record the call, especially business people or boss, call recording function is very helpful, mainly shown in the following points:

1. In the current social atmosphere, many things need evidence. Call recording function is undoubtedly a great demand for some people. Recording phone conversation sometimes is also a good way to protectourselves.

2. Business people, during the call, some important information may not be timely recorded or remembered, which may cause loss after the call, losing some business opportunities. Call recordings can be a basis whenmake some major decisions. As the saying goes, verbal statements are no guarantee, especially cooperation content communication and promises between two enterprises.

3. Other aspects.

Regarding to the above needs, ourcompany developed the call recording earphone, especially against the problem that Apple phone can not record the call during the conversation.Of course, it can also be used by Android mobile phone. This product iseasy to use, simple appearance. When you do not need recording function, you can use it as a commonearphone to listen tosongs.

Another call recording product is mobile phone Bluetooth call recorder, against the cellphone radiation when answering thecall. Turn on mobile phone Bluetooth, connected with this call recorder. It has call automaticanswering function. In the process of answering, you can record the call content,used as evidence on some commercial or special occasions.

Features and advantages

Support apple cellphone recording phone conversation.

Can be commonly used by Android phone.

Press button to record.

Call recorder function.

Built in lithium battery.

Play the previous/next, recordings playback.

Delete function.

Automatic call recording function, auto answer function.

Bluetooth wireless connection.

Can copy the recording files out from the earphone connected to computer via USB cable.

Businessmen, enterprise boss, reporter, lawyer, lovers and other people who need to record phone conversation, family, office.

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Music alarm clock can play songs, different from traditional alarm clock. This alarm clock has USB interface. The inner voice files can be replaced. You can copy what you like, any mp3 files. We also accept function customization, such as alarm clock with recording function. We can provide circuit board or finished products.

Features and advantages

Adopt WT2003 voice chip as core circuit,able to replace audiofiles.

With USB port, connected to computer to change audio files.

32Mbit SPI-FLASH memory, can download about 4-minute MP3 music (Memory size can be chose).

Greeting card module is very common in toys or gifts. Our company has many types of greeting card modules. Music files can be replaced by yourselves. There are also recordable greeting card modules, which can record any voice and playback. We can also provide music greeting cards, recording greeting cards, we accept customization as you required.

Features and advantages

☆Music playing function.

☆Sound can be human voice, songs, music, advertisement and so on.

☆Can be used as ordinary greeting cards.

☆Push-button type: press play button toplay sound;

☆Mechanical type: open the CARDS began to put a voice;

☆Optically controlled type: open the card, it starts to play sound (affected by light, darkness or light too weak will affectthe sound play.)

☆Voice recording type: record through microphone, press button to play, need no software,able to repeat recording.

This small adhesive voice player is developed by our company, used in gifts, greeting cards. It belongs to SoundSticker series. SoundSticker I is playing audio with induction function, such as light sensor activated, shadow control, human body induction. This type is usually OTP, can use our IC Prog to program in batch, can program many at once. SoundSticker II is recordable, also named recording box. This type supports customization, easy to use. Just press record key to record; press play key to play the recording. It is powered by button battery. Have long recording time. Users can repeat using.

This product is built in greeting card circuit board, recording circuit board, different from the appearance of traditional greeting card circuit board. It has outer casing decorated and protected. The sticker can be customized.

Squeeze box is a kind ofpush-in type IC voice box,small music box. shape is roundor square. Seller can takeit as a small gift given to buyer. As long as gently squeeze,it will play the recorded songs, product introduction or brand advertising and so on. This can be used inside the toy, which can make toys play all kinds of sounds.

Elevator counterweight ranging collision avoidance warning system, is a safety protection device, mainly used for safety early warning, to remind workers during elevator maintenance work .

It adopts ultrasonic detection technology, detection precision up to centimeter level, mainly used to prevent dangers during the elevator maintenance operation process. Sometimes the maintenance workers in the elevator counterweight, they cannot find danger timely, unable to escape in time, which will cause life safety threat.